package com.codeforces;

import java.util.Scanner;

public class _236A {

	static String s;
	static int[] vis = new int[26];
	static int count = 0;
	
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		s = scanner.next();
		for (int i=0;i<s.length();++i) {
			char c = s.charAt(i);
			int idx = c - 'a';
			if (vis[idx] != 1) {
				vis[idx] = 1;
				count++;
			}
		}
		if (count % 2 == 0) {
			System.out.println("CHAT WITH HER!");
		}
		else {
			System.out.println("IGNORE HIM!");
		}

	}

}
